There is a bug introduced in Sonoma where occasionally if you try to drag a window from one display to the other, when you reach the second display the window collapses into the Stack view (the little 3D angled tiny window that would appear along the left hand side of stage manager) making it impossible to complete the move from one display to another without disabling and re-enabling Stage Manager. Wasn’t an issue on Ventura so it’s pretty annoying as someone who pretty much only uses multiple displays on a daily basis and pretty concerning that Stage Manager is already collecting bugs after only a single year.
Others on Reddit reporting similar issues.
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